I'm going to be running a sealed room setup. The fan will only be used to cool the two hoods. Fresh air will be drawn in from outside, through both hoods, and exhausted back outside. Should be roughly 3 feet of ducting from intake flange to first hood. 2-3 feet of ducting between the hoods and another 3 feet from the second hood to the exhaust. There will be one 180 degree bend to serve as a light trap, but all other runs will straight.

I've just never fan two 1000w lights in a row before, my old setup has always been a pair of air cooled 600w each with their own fan, so not really sure how to calculate the cfm requirements for this new fan.